A murderer’s row of hip-hop royalty – including Jay-Z, Damon Dash and Russell Simmons – packed a courtroom yesterday to support the rap-label honchos on trial for allegedly laundering money for a notorious drug kingpin.

Power players Dash and Jay-Z, alongside Ashanti and Ja Rule, sat stone-faced, shoulder to shoulder, in the front row of the packed Brooklyn federal courtroom.

Fat Joe took his place a few rows behind, with hip-hop impresario Damon Dash in the gallery.

Simmons, also in the front row, told reporters during a break that the feds had poor priorities.

“Poverty and ignorance is more of problem in our community than convicting our poets,” he said.

The buzz created by an overwhelming glitterati quickly subsided as the trial of Murder Inc. heads Irv and Chris “Gotti” Lorenzo went into its last lap.

“Money going out, money coming back,” said Assistant U.S. Attorney Carolyn Pokorny in her closing argument. “This is what this whole case is about.”

The Lorenzos, whose label is now known as The Inc., allegedly washed $1 million in dirty dollars for Queens drug lord Kenneth “Supreme” McGriff. The kingpin got his money back in full with corporate checks, pricey travel expenses and a free soundtrack for his movie “Crime Partners,” prosecutors charge.

“The money just doesn’t add up,” said Pokorny before detailing the close ties between McGriff’s “Supreme Team” of drug dealers and the rap label.

“You can see how Supreme’s gang starts to meld and become totally embedded in Murder Inc.,” the prosecutor said, describing how McGriff’s cronies scored paying gigs at the label.

In that group is Robert “Son” Lyons, the gunman believed to have shot rapper 50 Cent nine times in June 2000. He later became Ja Rule’s bodyguard.

The prosecutor then pointed to Chris Lorenzo’s bank records, claiming that more cash would be withdrawn from his accounts than he made in a given year.

“Chris sure does look like a money launderer,” she said, after recounting the testimony of a former Murder Inc. assistant who said he saw McGriff deliver shoeboxes filled with cash to Chris Lorenzo.